will depend more on whether Ryobi kills off the USB Lithium line like they did the Tek4 line.
This is where learning how to rebuild your own batteries cones in. Nearly all of them use multiple 18650 batteries, which cost about $2 each online.
I've rebuilt a few for my power tools. Larger ones cost about $10-$15 to rebuild. And newer batteries have greater capacity too.
I think he's talking about with ARM-based systems things tend to be more monolithic.
I don't know that this is true, I haven't read enough about them.